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US3988001A - Variable flow control valve for use with dental syringes and the like - Google Patents

Variable flow control valve for use with dental syringes and the like Download PDF

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Publication number
US3988001A
US3988001A US05/597,547 US59754775A US3988001A US 3988001 A US3988001 A US 3988001A US 59754775 A US59754775 A US 59754775A US 3988001 A US3988001 A US 3988001A
Authority
US
United States
Prior art keywords
valve
valve member
seat
housing
axially
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/597,547
Other languages
English (en)
Inventor
Rajko Kankaras
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nalge Nunc International Corp
Original Assignee
Sybron Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sybron Corp filed Critical Sybron Corp
Priority to US05/597,547 priority Critical patent/US3988001A/en
Priority to DE19762632529 priority patent/DE2632529A1/de
Application granted granted Critical
Publication of US3988001A publication Critical patent/US3988001A/en
Assigned to NALGE COMPANY reassignment NALGE COMPANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SYBRON CORPORATION, A CORP. OF NY
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
    • A61C1/0007—Control devices or systems
    • A61C1/0038—Pneumatic systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K25/00—Details relating to contact between valve members and seats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/52—Mechanical actuating means with crank, eccentric, or cam
    • F16K31/524—Mechanical actuating means with crank, eccentric, or cam with a cam
    • F16K31/52408—Mechanical actuating means with crank, eccentric, or cam with a cam comprising a lift valve

Definitions

  • the present invention relates generally to valves and more specifically to valves as may be used in dental syringes and the like.
  • valves For many applications, and in particular dental syringes, a valve is needed which is activated by axially pushing the valve actuator. It is also important for dental applications that the dentist have close control of the fluid flow from the syringe from zero flow to the designed maximum flow of the valve. These two features heretofore have been difficult to reconcile in valves of the prior art. In many valves of the prior art where the valve seal member is moved axially from the valve seat, the entire circumference of the valve is open to accommodate the fluid flow. Accordingly, in this type of prior art valve, it was necessary to maintain close, critical tolerances between the opening of the valve seat and the valve member. Not only is it expensive to maintain such close tolerances as required in such a valve but, the valve member itself must be hardened as any wear reduces the amount of control over the flow which can be exercised by the dentist. All these factors added considerably to the cost of the valve.
  • valve of the present invention not only allows for a greater control of flow than valves of the prior art, but also accomplishes this control while utilizing considerably less critical tolerances which in turn greatly reduces cost. Further, since the tolerances are reduced, wear becomes less of a factor so that the life of the valve is prolonged.
  • valve actuator In the valve of the present invention, a slight negative pressure is created when the valve actuator is releaased so that when the valve is closed, fluid is drawn from the nozzle and back into the valve housing where there is less likelihood of contaminaation and dripping is prevented.
  • the aforementioned features of the present invention are accomplished by tilting the valve member on, and with respect to, its seat responsive to the initial axial movement of the valve actuator. This opens only a portion of the total circumference of the valve to fluid flow. Continuing the axial movement of the actuator then drives the entire valve member from its seat to open the entire circumference of the valve to fluid flow. Still further movement of the actuator drives the valve member entirely from the seat to provide the maximum valve opening. On release of the actuator, the valve member is returned to its seat to close the valve. A bias means continues to operate on and move the actuator after the valve member is seated. This provides a suction which draws fluid from the nozzle back into the valve housing.
  • the present invention may be characterized in one aspect thereof by the provision of a generally cylindrical valve housing having an inlet and an outlet and a valve seat intermediate the inlet and outlet; a valve member including a bias means to urge the valve member against the seat, the valve member having a portion provided with a cam follower; an axially movable actuator having a cam surface thereon engaging the cam follower portion of the valve member, the axial movement of the actuator causing the cam surface to engage the cam follower to tilt the valve member on its seat to partly open the valve and continued axial movement of the actuator moves the valve member from its seat to completely open the valve.
  • One object of the present invention is to provide a valve for dental syringes and the like which allows an almost linear volume control of fluid flow from zero flow to the design maximum.
  • Another object of the present invention is to provide a valve for dental syringes and the like wherein axial movement of the valve actuator initially tilts the valve member with respect to the valve seat and thereafter moves the valve member from the seat.
  • Still another object of the present invention is to provide a valve for a dental syringe or the like which greatly reduces the tolerances required between the valve member and the opening of the valve seat.
  • a further object of the present invention is to provide a valve for dental syringes and the like wherein a negative pressure is created within the valve housing upon release of the actuator so as to present the escape of fluid from the nozzle of the valve when the valve is closed.
  • a still further object of the present invention is to provide a valve for dental syringes and the like which is economical to manufacture and simple to install and replace.
  • FIG. 1 is a schematic presentation of a typical prior art valve.
  • FIG. 2 is a cross-sectional view of the valve of the present invention in a closed position
  • FIGS. 3 and 4 are views similar to FIG. 1 only showing a portion of the valve with the valve member in partly open positions;
  • FIG. 5 shows graphic representations of the open crosssectional areas of the valve in various partly open and full open positions.
  • FIG. 1 labeled prior art shows a portion of a typical flow control valve for dental syringes and the like.
  • the valve includes a housing 2 having a annular valve seat 3. Flow of the fluid is upward through the valve as viewed in the figure.
  • the valve seat is sealed by a gasket 4 fixed to a valve member 5. Opening the valve is accomplished by simply moving the stem 6 of the valve member axially downward as viewed in the figure so that the entire periphery about the valve member is open to fluid flow.
  • the diameter of the valve opening 7 was 0.1390 inches and the maximum outside diameter of valve member 5 was 0.1387 inches.
  • the tolerances in both cases was plus or minus 0.0001 inches.
  • the clearance between valve member and valve opening is only 0.0003 inches.
  • FIG. 2 shows the valve of the present invention generally indicated at 10.
  • the diameter of the valve opening has been kept at 0.139 inches while reducing the maximum diameter of the valve member to 0.132 inches and most importantly, reducing the tolerances in both cases to 0.007 inches.
  • the valve includes a valve housing 12 designed for insertion into a bore 18 in the dental syringe 20.
  • valve housing 12 Located between valve housing 12 and syringe bore 18 are O-rings 26 which prevent leakage between the valve housing and the syringe bore.
  • Housing 12 has an inlet port 28 communicating with syringe inlet 22 and an outlet port 30 communicating with the syringe outlet 24. Furthermore, the valve housing is necked at 16 intermediate the inlet and outlet ports to define an annular valve opening 32 communicating with both the inlet and outlet ports. The lower end face 34 of this neck defines a valve seat.
  • valve member 36 Disposed within and extending through valve opening 32 is a floating valve member 36, that is, the valve member is not fixed to any other part of the valve.
  • the lower portion of the valve member carries a resilient seal ring 38. Seal ring 38 is urged against the valve seat 34 by a spring 39 which is biased between the valve member and end cap 14. Thus, the spring urges valve member 36 and therefore, seal ring 38 upwardly as viewed in the figure so that under normal conditions, valve opening 32 is closed.
  • the valve member has a body portion 40 disposed in the valve opening, the outer surface of this body portion being somewhat dome-shaped. Extending upward from the top of this dome is a cam follower 42 for purposes set out hereinbelow.
  • a valve actuator for opening the valve includes a manually operated push button 44 extending out from the syringe bore and a depending stem 46 extending into the valve housing 12.
  • the depending stem has a cam surface 48 on its lower most face adapted to engage cam follower 42.
  • the actuator moves axially in the valve housing and is normally biased in an upward direction as viewed in the figure by a spring 50 which is biased between valve housing 12 and a collar 52 on actuator stem 46.
  • An O-ring 54 disposed about stem 46 between the collar and the valve housing provides a sliding seal between the actuator and the internal wall surface of the valve housing.
  • valve member 36 In order to operate the valve, push button 44 is depressed to move the actuator axially against the bias of spring 50. This brings cam surface 48 into engagement with cam follower 42. Further axial movement of the push button will now cause the cam to tilt valve member 36 and move it slightly from its vertical orientation. This is shown in FIG. 3.
  • the body portion 40 of valve member 36 is somewhat dome-shaped. This allows the member to clear valve opening 32 when valve member 36 is tilted.
  • a portion of seal ring 38 is lifted from valve seat 34 to unseal a portion of the valve opening as shown at 56.
  • the opposite side of seal ring 38 remains in engagement with seal seat 34 as shown at 58.
  • the unsealed portion at 56 is generally cresent-shaped.
  • valve member 36 continues to tilt which moves more and more of resilient seal ring 38 from the seal seat. This continues until the seal ring has been completely removed from the seat as shown in FIG. 4. Further movement of the actuator will now simply drive valve member 36 against the bias of spring 39 and move the dome-shaped body 4 through valve opening 32 thereby increasing the cross-sectional open area of the valve opening available for fluid flow.
  • FIG. 5(a) shows that when the actuator is initially depressed, and valve member 36 tilted on its axis only a portion of the circumference of the valve opening is available for fluid flow.
  • FIG. 5(b) shows the actuator has been depressed to the point where seal ring 38 is completely removed from valve seat 34.
  • FIG. 5(c) shows the cross-sectional area available for fluid flow when the actuator is fully depressed so as to move valve member 36 through valve opening 32.
  • the dome shape of the valve member body portion 40 together with the linear profile of valve opening 32 creates the greatest open area for fluid flow around the body portion and through the openings.
  • FIGS. 5(a), 5(b), and 5(c) are only representative of three valve positions and that a more infinite range between the full open and full close position can be accomplished with the valve of the present invention.
  • releasing push button 44 not only will close the valve, but also will draw any liquid remaining in syringe outlet 24 back into valve housing 12 so as to reduce or eliminate any drip of seepage from the outlet.
  • spring 39 will return valve member 36 to an initial position and reseat seal ring 38 against seal seat 34.
  • Spring 50 likewise moves the actuating member (push button 44 and depending stem 46) back to its initial position.
  • the actions of springs 39 and 50 are independent so that spring 50 continues to move the actuating member even after seal ring 38 is seated against seat 34.
  • the present invention accomplishes its intended objects in providing a valve for dental syringes and the like which provides substantially linear control of the fluid flow from zero flow to the designed maximum of the valve.
  • the structure of the valve of the present invention also eliminates the need for relatively close tolerances between the various components of the valve and also provides a feature which prevents dripping of liquid from a syringe nozzle when the valve is closed.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Epidemiology (AREA)
  • Dentistry (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Water Supply & Treatment (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
US05/597,547 1975-07-21 1975-07-21 Variable flow control valve for use with dental syringes and the like Expired - Lifetime US3988001A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US05/597,547 US3988001A (en) 1975-07-21 1975-07-21 Variable flow control valve for use with dental syringes and the like
DE19762632529 DE2632529A1 (de) 1975-07-21 1976-07-20 Steuer-ventil fuer zahnaerztliche spritzen u.dgl. zur durchfluss-steuerung fliessfaehiger medien

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/597,547 US3988001A (en) 1975-07-21 1975-07-21 Variable flow control valve for use with dental syringes and the like

Publications (1)

Publication Number Publication Date
US3988001A true US3988001A (en) 1976-10-26

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ID=24391983

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/597,547 Expired - Lifetime US3988001A (en) 1975-07-21 1975-07-21 Variable flow control valve for use with dental syringes and the like

Country Status (2)

Country Link
US (1) US3988001A (de)
DE (1) DE2632529A1 (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2383655A1 (fr) * 1977-03-14 1978-10-13 Kaltenbach & Voigt Instrument pour la dentisterie
US4133345A (en) * 1977-06-08 1979-01-09 Clarence Mitchell Attitude insensitive valve
US4161308A (en) * 1976-03-15 1979-07-17 Vapor Corporation Switching valve assembly for fluid motor-driven injector pump
US4523700A (en) * 1981-11-27 1985-06-18 Emco Wheaton, Inc. Low flow control nozzle
US4817913A (en) * 1988-09-12 1989-04-04 Sloan Valve Company Flushometer relief valve
US4946135A (en) * 1990-01-08 1990-08-07 Yang Shun Ching Structure of water tap
US5915674A (en) * 1996-02-10 1999-06-29 Suspa Compart Aktiengesellschaft Adjustable-length gas spring
US6027099A (en) * 1998-03-20 2000-02-22 Snap-On Tools Company Tip valve for pneumatic tool
US20050022661A1 (en) * 2003-07-23 2005-02-03 Zanden James Vander Snap-in rotatable cylinder control
ES2255344A1 (es) * 2003-04-01 2006-06-16 Gain Gas Technique, S.L. Dispositivo de mando para el accionamiento de un cilindro a gas.
US20060173419A1 (en) * 2005-02-02 2006-08-03 Malcolm David R Medical fluid delivery system and method relating to the same
US20070171319A1 (en) * 2006-01-26 2007-07-26 Sanyo Epson Imaging Devices Corporation Liquid crystal apparatus and electronic device
US11060618B2 (en) 2019-05-21 2021-07-13 Husky Corporation Integral tilted poppet valve for controlled flow of fuel from fuel dispensing nozzle

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1291729C (en) * 1987-06-03 1991-11-05 Loctite Corporation Sealless dispensing mechanism

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2526457A (en) * 1949-02-03 1950-10-17 Hydraulic Brake Co Master cylinder
AT168360B (de) * 1948-10-23 1951-05-25 Johann Ing Dunz Ventil
US2622435A (en) * 1948-09-15 1952-12-23 Lillian King Sediment tester head
US2934902A (en) * 1955-07-01 1960-05-03 Bendix Aviat Corp Valve for master cylinder
US2984452A (en) * 1958-09-04 1961-05-16 William J Hooper Syringe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2622435A (en) * 1948-09-15 1952-12-23 Lillian King Sediment tester head
AT168360B (de) * 1948-10-23 1951-05-25 Johann Ing Dunz Ventil
US2526457A (en) * 1949-02-03 1950-10-17 Hydraulic Brake Co Master cylinder
US2934902A (en) * 1955-07-01 1960-05-03 Bendix Aviat Corp Valve for master cylinder
US2984452A (en) * 1958-09-04 1961-05-16 William J Hooper Syringe

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4161308A (en) * 1976-03-15 1979-07-17 Vapor Corporation Switching valve assembly for fluid motor-driven injector pump
FR2383655A1 (fr) * 1977-03-14 1978-10-13 Kaltenbach & Voigt Instrument pour la dentisterie
US4133345A (en) * 1977-06-08 1979-01-09 Clarence Mitchell Attitude insensitive valve
US4523700A (en) * 1981-11-27 1985-06-18 Emco Wheaton, Inc. Low flow control nozzle
US4817913A (en) * 1988-09-12 1989-04-04 Sloan Valve Company Flushometer relief valve
US4946135A (en) * 1990-01-08 1990-08-07 Yang Shun Ching Structure of water tap
US5915674A (en) * 1996-02-10 1999-06-29 Suspa Compart Aktiengesellschaft Adjustable-length gas spring
US6027099A (en) * 1998-03-20 2000-02-22 Snap-On Tools Company Tip valve for pneumatic tool
EP0983459A4 (de) * 1998-03-20 2004-06-16 Snap On Tools Co Kopfventil für pneumatische werkzeuge
ES2255344A1 (es) * 2003-04-01 2006-06-16 Gain Gas Technique, S.L. Dispositivo de mando para el accionamiento de un cilindro a gas.
ES2255344B1 (es) * 2003-04-01 2007-10-01 Gain Gas Technique, S.L. Dispositivo de mando para el accionamiento de un cilindro a gas.
US7007587B2 (en) 2003-07-23 2006-03-07 Suspa Incorporated Snap-in rotatable cylinder control
US20050022661A1 (en) * 2003-07-23 2005-02-03 Zanden James Vander Snap-in rotatable cylinder control
US20080077092A1 (en) * 2003-07-23 2008-03-27 Universal Infusion Technology, Llc Medical fluid delivery system and method relating to the same
US20080086088A1 (en) * 2003-07-23 2008-04-10 Universal Infusion Technology, Llc Medical fluid delivery system and method relating to the same
US7896017B2 (en) 2003-07-23 2011-03-01 StnDrd Infusion Corp. Medical fluid delivery system and method relating to the same
US20060173419A1 (en) * 2005-02-02 2006-08-03 Malcolm David R Medical fluid delivery system and method relating to the same
US7367358B2 (en) 2005-02-02 2008-05-06 Universal Infusion Technology, Llc Medical fluid delivery system and method relating to the same
US20070171319A1 (en) * 2006-01-26 2007-07-26 Sanyo Epson Imaging Devices Corporation Liquid crystal apparatus and electronic device
US11060618B2 (en) 2019-05-21 2021-07-13 Husky Corporation Integral tilted poppet valve for controlled flow of fuel from fuel dispensing nozzle
USD963798S1 (en) 2019-05-21 2022-09-13 Husky Corporation Tilted poppet valve for fuel dispensing nozzle

Also Published As

Publication number Publication date
DE2632529A1 (de) 1977-02-10

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Legal Events

Date Code Title Description
AS Assignment

Owner name: NALGE COMPANY, A CORP OF DE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SYBRON CORPORATION, A CORP. OF NY;REEL/FRAME:004628/0848

Effective date: 19860731